http://www.legalcheek.com/lc-journal-posts/the-curious-case-of-zapata-v-hsbc-holdings-plc-what-happens-when-mexican-drug-cartel-victims-take-on-the-banks/#comment-968524
HSBC are being sued in the US for laundering money from drug cartels and embargoed states.
It might lead others to follow a similar route, in the UK RBS are already being tackled on how one of their divisions, GRG Global Restructuring Group profited from their hardship and loss.
http://www.channel4.com/news/rbs-whistleblower-grg-business-destroy-video
The results of this case could have wide ranging consequences for the banking sector. If they win then the wider effects of fractional reserve banking could be curtailed.